Chances are you have the clucene core of the diablo devel repository, and a sword package that has been compiled against another version of clucene.

The last chinook working package was using a sword version compiled against
clucene-core_0.9.16a-2_armel.deb

http://repository.maemo.org/extras/p...6a-2_armel.deb

Things _should_ work if all the needed package (clucene-core,sword,python-sword) are the latest one from the chinook extras devel repository.